26 - 6 - 7=13 2 + 2 - 4=0
7 + 9 + 2=18 8 * 9 - 2=70
9 + 9 + 2=20 8 *4 - 2=30
<span>9 *2 - 2=16 40: 5*7=56</span>
1к-4/9к+1/6к=к(1-4/9+1/6)=
к(18/18-8/18+3/18)=13/18к
I2х-1I>3
2х-1>3 2х>4 х>2
2х-1<-3 2х<-2 х<-1 2<x<-1
I4x+5I<5
4x+5<5 4x<0 x<0
4x+5>-5 4x>-10 x>-2.5 -2.5<x<0
(2х+1 - (х+1))(2х+1 + (х+1))>0
(2х+1-х-1)(2х+1+х+1)>0
2х(3х+2)>0
х>0 x>-2/3
<span>а) 2а – ( 7 – 2а )=</span><span><span> 2а-7+2а= 4а-7</span></span>
б) − 2а – 2( −а + 7) +14=-2а+2а-14+14=0
в) 3( − 2х – 4) + 2(3х + 8) + 2х= -6х-12+6х+16+2х=4+2x